A student is labeling a diagram of mitosis. Which description should the student label as anaphase?
A. The chromosomes separate and move along spindle fibers to opposite ends of the cell.
B. The chromosomes, which were distinct and condensed, begin to spread out into a tangle of chromatin.
C. The centromeres of the duplicated chromosomes line up across the center of the cell.
D. The genetic material inside the nucleus condenses and the duplicated chromosomes become visible.